Lake Marie Reservoir Report

Last Updated: December 5, 2025

Lake Marie, located in Napa, California, is a state-regulated reservoir with a primary purpose of water supply for irrigation and other uses.


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Summary

Built in 1908, this earth dam stands at a height of 60 feet and has a storage capacity of 170 acre-feet. With a surface area of 8 acres and a drainage area of 1.06 square miles, Lake Marie plays a crucial role in the water resource management of the region.

Managed by the California Department of Water Resources (DWR) and Safety of Dams, Lake Marie has a high hazard potential but is currently in satisfactory condition according to a 2017 assessment. The dam has a spillway width and other structural details are not specified in the available data. The reservoir is situated along the Tr Tulucay Creek and is part of the Sacramento District.

Overall, Lake Marie serves as a vital water source for the surrounding areas, showcasing the intersection of water resource management and climate considerations in maintaining the safety and sustainability of this essential infrastructure.

Year Completed

1908

Dam Length

454

Dam Height

60

River Or Stream

Tr Tulucay Cr

Primary Dam Type

Earth

Surface Area

8

Hydraulic Height

36

Drainage Area

1.06

Nid Storage

170

Hazard Potential

High

Nid Height

60
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.